Abstract
We investigate gauge-invariant cosmological perturbations in a spatially flat Friedmann-Robertson-Walker universe with scalar fields. It is well known that the evolution equation for the gauge-invariant quantities has exact solutions in the long-wavelength limit. We find that these gauge-invariant solutions can be obtained by differentiating the background solution with respect to parameters contained in the background system. This method is very useful when we analyse the long-wavelength behaviour of cosmological perturbations with multiple scalar fields.
| Original language | English |
|---|---|
| Pages (from-to) | 2761-2772 |
| Number of pages | 12 |
| Journal | Classical and Quantum Gravity |
| Volume | 15 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - Sept 1998 |
| Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)